Automatic winder



Sept. 14, 1948. w. scl-iwEn-ERl 2,449,328

y AUTOMATIC WINDER Filed July 13, 1940 Sheets-Sheet 1 H5 y:l wwwATTORNEYS Sept. 14, 1948. w, SCHWEITER 2,449,328

AUTOMATIC WINDER Filed July 13, 1940 s sheets-sheet 2 "mazm' f fj/ v I I@3 J INVENTOR. Q2 v :MZ'h

BY .33 30 ,MW

ATTORNEYS l Sept 14, 1948- w. scHwErrER 2,449,328

AUTOMATIC WINDER Filed July 13. 1940 3 Sheets-Sheet 3 INVENTOR MMR fATTORNE s Patented Sept. 14, 1948l I OFFICE AUTOMATIC WINDR WalterSchweiter, Horgen, Switzerland, assignor to Maschinenfabrik Schwelter A.G., a corporation oi' Switzerland Application July 13, 1940, Serial No.345,255 In Switzerland August 25, 1939 8 Claims. (Cl. 242-19) 1 Theinvention is an improvement in automatic winders which are machines thattake empty bobbins from a magazine and wind them with yarn and thendischarge the wound bobbin. When the yarn is severed, in order torelease the wound bobbin from the machine, the cut end still remainingin the machine has to be attached to the next-arriving empty bobbin tostart the winding on it, and this `is done by mechanism which lays suchyarn across the face of the winding head so that it will be pinchedagainst the end or butt of the fresh bobbin when the winding headadvances to engage and rotate the bobbin. The length oi yarn requiredfor this purpose remains as a tail on-the discharged bobbin and has tobe torn off by hand before the bobbin goes intouse.

The purpose of this invention is to remove such tail in thewindlng`machine automatically and prior to the discharge of the bobbinso that the latter is immediately ready for use. Such removal isaccomplished according to this invention vwhile the bobbin is still inits winding position and by means of a suitable parting tool whichsevers the yarn between the point where it is pinched against orotherwise attached to the bobbin and the point where it becomes part` ofthe wound mass on the bobbin. There is no limitation herein to anyparticular style of bobbin or core and all kinds are included in theterm bobbin.

In the accompanying drawings, which are to be taken as illustrative onlyof the invention:

Fig. 1 represents a side elevation of the bobbin in winding position andits associated winding mechanism having the preferred form of theinvention applied to it;

Fig. 2 is asimilar view with parts removed and at a later stage in thewinding cycle;

Fig. 3 is a sectional detail illustrating the relaion of the yarn to thebobbin butt, above referred Figs. 4 and 5 are detail cross sections ofthe mechanism, showing thepreferred form of the invention;

Fig. 6 is a plan view of certain parts of the control gear.

Qnly so much oi an automatic Winder is shown as is necessary to exhibitthe relation of the present invention to this class of machines. i

Referring'to Figs. 1 and 2, it will be understood that empty bobbinsmarked I are transferred one by one from a hopper, not shown, to thewinding position in which they are successively clamped between thewinding head 2 and the rotary, spring-yielding center 3 of a fixed tailstock 4. In

the Winder taken for illustration, the winding head 2 is automaticallyadvanced and retracted to accomplish this function, but the clampingcould also be done by the advance of the tail stock 4 so f lfar as theprinciple of this invention is concerned.

.- The transferrer is indicated at in Fig. 5 and will be understood towithdraw automatically when the winding head has taken charge of the:bobbin,

The yarn is guided to the rotating bobbin by means of a traveling yarnguide 6, later referred to, and when the winding head is retracted atthe end of the winding stage the full bobbin falls butt first into thedischarge chute 1. While it is momentarily held in the chute, the yarnstill connected to it is engaged by two lingers, one

below the winding head marked 8 in Fig. 2, and

one above the head marked 9 in the same figure.

nism contained in or mounted on the gear 'case I I, the construction ofwhich isalready known to the art. The tail-stock 4 is mounted on the endof a frame rod I2 rigidly projecting from this gear case as its support;and the carriage I3 in which the yarn guide 6 is held slides on thisrod, being advanced along it slowly by means of a chain I4 driven by aratchet-operated sprocket wheel I5 and against the tension of a returnspring I6. The yarn guide carriage initiates the Y bobbin-changing cycleby tripping ya suitable member, not shown, when it reaches the end of vthe bobbin. This releases the ratchet-sprocket wheel, permitting thespring I6 to return the carriage to its place of beginning, ready tostart the winding on a fresh bobbin.

The yarn guide shown is designed to lay the yarn on the bobbin with aprogressive criss-cross .pattern as customary for filling bobbins. butthis i is a matter of choice. Such guide is carried as an arm on theupper end` of a short rock shaft Il journalled in the carriage I3 andprovided with a` crank finger I8 at its lower end which travels along arail I9 carried on a rock shaft 20, as the',

carriage advances. The oscillation ofthe rock". shaft oscillates theyarn guide against as,sr 1irtlg, not shown, thereby giving a wig-wasmtiQIithe guide-eye as the carriage moves along, all of,

n also according to design now standard,

gxil bfrrgilng no part oi this invention; other yarn-guiding mechanismis well known and could bstltuted. be'Ill'ile operation of the windinghead 2 as described is accomplished by journalling its spindle in asleeve bearing, slidably mounted in the gear box, and moved back andforth by a link connec- ;tion 2| with a cam and cam-lever 22 inside thethe yarn carriage has returned to the start position. The head is thenretracted to release the bobbin as above explained and the winding headis therefore not rotating when the tail of the yarn is laid against itas above described,

The parting device of this invention is mounted in any convenient way tooperate on that section or length of yarn that crosses over the bobbinbutt, or the end to which the yarn is pinched; see Fig. 3. It mayconsist of any suitable yarn-severing member herein called a knife andmarked 30, and the yarn is severed by encountering it, as it is carriedaround by the bobbins rotation. It is rendered active in the presentcase by being advanced to its operating position where the yarn willstrike it, and this is preferably done by pivoting it, as at 3 I, to anadjustable bracket 32 secured to the face of the gear box. It can thusbe swung from an operating position close to the bobbin as shown in Fig.4 to a remote position indicated in Fig. 5, where it will not be likelyto interfere with the arrival of empty bobbins. A spring Sia normallyurges it to one of its positions, preferably its remote position and aset-screw 33, in the bracket 32, serves as a lnal limit to its motiontoward the bobbin.

When the core or bobbin is supplied with reenforcement rings asindicatedat 34, each of these forms a peripheral shoulder over which the yarnextends and by means of which a short section of the yarn, between or atthe sides of the rings is held clear of the bobbin surface and theworking position of the knife is gauged so that its hook-shaped endenters the crevice or groove between adjacent rings. or at the side ofone oi them, hooking into the yarn since this makes for a more reliableseverance. but within the invention it is only important that the knifeapproach the bobbin close enough to make the cut without injuriouscontact with it. The use of a corrugated or cross-grooved butt istherefore not indispensable although it is preferred. The adjustmentprovided in the bracket 32 is in the direction of the bobbin axis andenables the knife Position to be registered accurately with the crossgroove of the bobbin, but at the same time the knife arm is susceptibleof some lateral movement by reason of its thinness and flexibility sothat in the event of an odd-sized or diierently contoured bobbin it maybe deflected by the rib or ringinto the adjacent groove. Such contact ofknifewith ring, if it should occur, is not injurious to the bobbin. Theknife thus has movement toward the bobbin and is capable of limitedmotion in the direction of the bobbins axis.

To put the knife in its active position, any

means working in phase with the bobbin-supply can obviously be used andin the present case such means is a linger-shaped cam 35 fastened to theyarn guide carriage in such position as to engage the top of the knifeand depress it toward the bobbin shortly after the carriage starts itsoutward traverse and while the guide eye is laying the initial turns onthe lowerpart of the bobbin. The nger rides over the back of the knifeand thus depresses it to the required extent, determined by itsadjustment and limited by the set screw 33. On the return of thecarriage. the knife is similarly and momentarily depressed but thisaction is not of consequence since the yarn has already been cut.

On the discharge of the bobbin, the severed piece or tail either fallsout of the way or is drawn out of the way by a suction scavenger hood.indicated at 33 in Fig. 1. Such removal may be facilitated, with orwithout the use of an air hood. by giving the winding head a shortrotation in its retracted position sulcient to throw the tail off in theevent it should tend to stick to it. Such throwing-off effect isproduced by providing a notch 31 at the appropriate point in cam 23which will close the clutch 23 for a few revolutions, while the windinghead is retracted, then bringing it to rest again in time to be advancedagainst the incoming bobbin. Thus the winding head is clutched to thedrive shaft twice during each cycle, once for rotating the bobbin andagain for clearing it of any adhering yarn.

I claim:

1. In automatic bobbin winders o! the kind in which the bobbins are fedto and discharged from the winding position and in which the yarn isinitially xed to a bobbin by being pinched between the end thereof andthe winding head and then wound on the bobbin by means of a thread guidewhich travels lengthwise of the bobbin and in which the bobbin has ashoulder over which the yarn extends from the point oi' pinching to theinitially wound yarn mass. the improvement which consists in thecombination with the winding head, the mechanism causing the yarn to bepinched against the head by a bobbin, and the thread guide mechanism, ofa movably-mounted knife and means moving with said thread guidemechanism for causing movement of the knife to a position at one sideo1' said shoulder but not in contact with the bobbin and in the path ofa" portion of the yarn that is clear of the bobbin, whereby the rotationofthe bobbin causes such yarn to strike the knife and be cut thereby.

2. In automatic bobbin winders of the kind in which the bobbins are fedto and discharged from the winding position and in which the yarn isinitially xed to a bobbin by being pinched between the end thereof andthe winding head and then wound on the bobbin by means of a thread guideon a carriage which travels lengthwise oi the bobbin, the improvementwhich consists in the combination with the winding head, the mechanismcausing the yarn to be pinched against the head by a bobbin. and thethread guide carriage. of a movably-mounted knife, and a cam on saidcarriage for causing the knife to be moved to a position close to butnot in contact with the bobbin and in the path of the yarn that extendsfrom the point of pinching to the initial part of `the yarn mass woundon the bobbin, whereby the tlobbin rotation causes the yarn to be cut bysaid n fe.

3. In automatic bobbin winders of the kind in which the bobbins are fedto and discharged from the winding position and in which the yarn isinitially fixed to a bobbin by being pinched between the end thereof andthe winding head and then wound on the bobbin by means of a thread guideon a carriage which travels lengthwise of the bobbin. the improvementwhich consists in the combination with the winding head. the

combination with a. knife for severing the section of yarn that extendsfrom the point of pinching to the initial part of the yarn mass wound onthe bobbin and means for rotating the winding head after the release ofthe bobbin to clear it of adhering yarn.

6. In a bobbin Winder as deilned in claim 5, means for stopping therotation of the winding head before the release oi the bobbin and meansfor momentarily rotating such head` after such release. to clear it ofadhering yarn.

which the hobbins are fed to and discharged from the winding positionand in which the yarn is initially fined to a hohoin by being pinchedbetween the end thereof and the winding head and then wound on thehohoin hy means oi athread guide which travels ienathwise of the bobbinand in which the hohhin has an annular projection around its hutt overwhich the yarn extends trom the ncint ci pinching; to the wound yarnmass, the improvement which consists in the combination with the Windinghead, the

mechanism causing the yarn to he pinched.

.3G -guide mechanism, of a knife movabiy mounted to advance into theannular space at one side y of said'projection on the hobbin and in thenath-4 aaainst the head by a bbin. and the thread of the yarn;4 andmeans for causing the knife to be so advanced after the hobbin is inrotation,` said knife being capable of movement lengthwise@ of thebobbin' to accommodate disaligrnznentwith-1Q 121' said annular space. .l5. In a bobbin Winder, meanslortransferring bobbins to and from thewinding position, a; winding head and a tail stock relatively movable toclamp the bobbln between them in such pol sition andradapted to pinchthe yarn between the end ofthe bobbin and the winding head',4 in

7. 'In a bobbin Winder as defined in claim 5, a winding head adapted foradvancing and re- -tracting movement to clamp and release a bobhin, adrive-shaft, connectible to said head to rotate it, means for retractingsaid head and means establishing driving connection between .said shaftand head while the latter is retracted.

In a bobbin Winder as defined in claim 5. a winding head adapted foradvancing and retracting movement to clamp and release a bobbin. meansior rotating said head in its retracted position to throw cd adheringyarn andi means adjacent the head adapted to catch such yarn.

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